In a novel, what is the proper way in US English to refer to a group by the character's self-styled label?
For example: In a novel, assume a group of software coders are working on an extremely challenging problem. While doing so, they start referring to themselves as the "Hacker_Masters."
In the text of the novel, would it be proper in the mind of an editor to refer to their label as:
- Hacker_Masters
- Hacker_Masters
- "Hacker_Masters"
- "Hacker_Masters"
- hacker_masters
- or something else?